Windows 7 - samsung ml-1640 driver issue.

Hello
This is my first post I don't know whether the question has already been asked. But my search in the forums has not shown any positive result.
Okay. Recently I installed windows 7 in my system upgrading from vista. Both are 32 bit. My Samsung ml 1640 is not recognized by OS. When I downloaded the Windows 7 drivers from Samsung site the file ml-1640_32bit.exe, installed the smart panel but stops at 75 per cent with the message, "You have no permission to change the settings for this printer. To change settings contact your system administrator." I ran the file as an administrator. I even turned off the UAC. But the drivers won't install.
Can you help me please.

With a big thanks,
sun